>deep core
can you stop with the memes
just train your fucking core it's not rocket science jesus christ

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>be impressionable kid
>watching Olympic swimming
>mom comments on a swimmer noticeably breathing through his chest
>"wow that's a good idea," she says unironically
>i start consciously doing it for some reason
>fast forward to today
can i sue her?

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>>76948893
stomach vacuums
it trains the transverse abdominis

>>76948893
>flared ribs
Flared ribs are a neurological problem. You learn to move certain ways and you stuck in postures and movement patterns because of it. You fix it by seeing a PT and paying him to train you address the systemic problem with a personalized approach.
>>76948902
>breathing through his chest
Breathing through expansion of the ribcage is normal. BTW, the guy in your pic has a wide ISA. They have a tendency to breath through the belly, hyper-extend the spine, and to keep their ribcage in external rotation contributing towards rib flare.

Yes. Ribflare is just a symptom of a postural problem and fixing it is done by teaching you to move and stand differently. No. Grinding away at situps or some other ab exercises won't fix the problem.